Lock.



H. G. VOIGHT.

LOCK.

- APPLIOATION FILED nu 27, 1911.

1,003,552. v Patented Spt. 19, 1911.

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UNITED OFFICE.

HENRY Gr. VOIGHT, OF NEVI BRITAIN, CONNECTICUT, ASSIGNOR- TO RUSSELL 8c ERWIN MANUFACTURING COMPANY, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

LOCK.

I,OO3,552.

Specification of Letters Patent.

Application filed May 27, 1911.

Patented Sept. 19, 1911. Serial No. 629,895.

To @ZZ whom it may concern.

Be it known that I, HENRY G. Voici-1T, a citiZen of the United States, residing at New Britain, county of Hartford, State of Connecticut, have invented certain new and useful I n'iprovements in Locks, of which the following is a full, clear, and exact description.

My invention relates to improvements in loc ts.

The object of the invention is to provide a simple means whereby it is within the power of the holder of a certain key to operate the mechanism in such a way as to prevent the operation of the bolt by anything save the same or a duplicate key. Such an improvement will be found to be advantageous in a hotel or dormitory having a largenumber of rooms under the charge of one person, where it may be desirable for that person to lock o certain rooms.

In the accompanying drawings, Figure 1 is a side elevation of my improved lock with certain parts removed. Figs. 2, 3 and 4 are different views of the upper portion of the lock showing parts thereof in different positions. Fig. 5 is an end view of the parts shown in Fig. 2, with the case in section on the line of the keyhole, the plane of said seetion being indicated by the line -zr. Fig. 6 is a similar' view of the parts as shown in Fig. 4, the case being in section on the line g/-y Fig. 7 is a side elevation of the blocking device detached. Fig. S is a view of what I will term a change key. Fig. 9 is a view of what I will term a guard key.

l represents a lock case.

2 is the ordinary latch-bolt.

3 is a dead bolt. The dead bolt 3 is mounted to reciprocate, being provided with the usual tail-piece 3a properly shaped to receive a key.

4 is a fence mounted on the tail-piece 3a.

5 is a tiltable blocking device having a slot G which stands over a pin 7 carried by the case l. rIhe blocking device 5 has at its rear end an l shaped opening, through which the end of the fence 4 projects. This blocking device 5 is preferably located closeto one inner wall of the case l. The bolt may be provided with the usual tumblers (not shown), which may be mounted upon the pin 7, said tumblers co-acting with the fence 4 in the usual manner.

S represents the change key and 9 reprep ployed.

sents the guard key. The change key is sometimes termed the guest-s key, while the guard key may be termed the proprietors key. It will be observed that the width of the bitting on the change key is greater than that on the guard key. The eXtra width is provided so that when the change key is employed, the blocking device will be operated thereby in the manner hereinafter described. The width of the bitted portion of the guard key is such that when the same is used, it will not influence the blocking device, since the same turns freely past the blocking device.

Starting with the parts in the position shown in Fig. 1, the dead bolt 3 is shown as retracted. If the change key 8 is inserted and turned, as shown in Fig. 2, it will operate the usual tumblers (not shown) and will lift the blocking device 5 so that the fence will enter the lower offset portion of the l.- shaped slot as shown. By continuing the turning of the key, the bolt will be advanced, together with the blocking device, so that when the key has been turned one complete revolution, the parts will assume the position shown in Fig. 3. Upon reinserting the change key, with the parts as shown in Fig. 3, the bolt may be retracted. When it is desired to block the lock against operation by the change key, the guard key 9 is em- Vhen the same is inserted in the lock (with the parts as shown in Fig. 1,) 'the turning of the key will lift the ordinary tumblers (not shown) to free the bolt 3, whereupon continued rotation of the key will advance the bolt. In this operation, however, the blocking device 5 is not disturbed and the fence will be caused to move from the position shown in Fig. l to the position shown in Fig. 4, entering the upper left-hand part of the L-shaped slot and assuming a position under which there is no clearance afforded to allow the blocking device to be lifted; hence, if, when the parts are as shown in Fig. 4, the change key is inserted, it is obvious that it can not be turned because the width of the bitted portion thereof will cause it to strike against the under side of the blocking device 5 before the regular tumblers can be moved to the bolt-releasing position, therefore, under such conditions, it is impossible for the holder of the change key to unlock the door.

The usual spring 10 may be employed, if

desired, to press the blocking device 5 down against the fence 4. lNhile I have shown the blocking device 5 at one side of the position to be occupied by the regular tumblers, it is obvious that the particular position of the blocking device is immaterial so long as the keys are properly adapted thereto whereby one key only will actuate the dead bolt independently of the blocking device and whereby the other key will actuate the blocking device in unison with the operation of the bolt in both directions under certain conditions, namely, when the parts start from the posit-ion indicated in Figs. 1 and 3.

What I claim is:

l. In a lock, a dead bolt arranged to be reciprocated to and fro by either one of two dierently bitted keys, a :tence on the dead bolt, a blocking device co-acting with said fence, said blocking device having both a swinging and a sliding movement, two keys, one being bitted to operate said boltwithout moving said blocking device, the other being bitted to simultaneously operate said blocking device and shift the same to and fro in unison with said bolt.

2. In a lock, a dead bolt arranged to be reciprocated to and fro by either one of two differently bitted keys, a fence on the dead bolt, a blocking device co-acting with said fence, said blocking device having both a swinging and a sliding movement, two keys, one being bitted to operate said boltwithout moving said blocking device, the other being bitted to simultaneously operate said blocking device and shift the 'same to and fro in unison with said bolt, an L-shaped passage in said blocking device, in which passage said fence stands, said blocking device being held against tilting movement when said fence is in one part of said passage and being free for tilting movement when said fence is in another part of said passage.

3. In a lock, a reciprocating bolt, a fence thereon, a blocking device arranged to tilt independently of the bolt and arranged to.

slide in unison with said bolt, said blocking device having a clearance passage for said fence, the lower side of said passage being stepped to make said passage deeper at one end than at the other and to form a shoulder, a key bitted to move said boltto and fro independently of said blocking device, another key bitted to tilt said blocking device to a position wherein said fence lies to the rear of said shoulder and to move said bolt and locking device bodily orwa rd and backward in unison with said bolt.

HENRY G. VOIGHT. lVitnesses GwnNDoLiNn A. JACKSON, M. S. WIARD.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents. Washington, D. C. 

